They've been around a while - aluminium and made in NZ with hydraulic powered back wheels - there's a little hydraulic pump under the seat that lowers the wheels and drives it along - they even have a little flatbed trailer that yoiu drive it onto and then it sort of squats down on it!
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Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)